Chronic sinusitis occurs when the spaces inside your nose and head (sinuses) are swollen and inflamed for three months or longer, despite treatment. this common condition interferes with the way mucus normally drains, and makes your nose stuffy. Chronic sinusitis an infection that lasts for more than tiga weeks and can continue indefinitely if not treated. it is often caused by allergies, fungal infections or weakened immune system. it is often caused by allergies, fungal infections or weakened immune weeks 3 sinusitis system. Our patients tell us that the quality of their interactions, our attention to detail and the efficiency of their visits mean health care like they've never experienced. see the stories of satisfied mayo clinic patients. Sep 25, 2019 · essentially, acute sinusitis is anything that lasts less than four weeks, says dr. ford, while chronic sinusitis lasts more than 12 weeks—but those are just ballparks. 27 aug 2019 fever longer than 3-4 days. you should also se...